Rotary classifier.



C. O. MICHAELSEN. ROTARY CLASSIFIER.

APPucATwN FILED AuG.26.1913. 1,140,700. Patend May25,1915.

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C. O. MICHAELSEN.

ROTARY CLASSIFIER.

APPLICATION man AuG.26,1913.

Patented May 25, 1915.

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.ROTARY cLAsslFlER.

APPLICATION FILED AUG.26, I9I3. Y 1,140,700. APamfmd May 25, r1915.

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IHE'NORRIS PETERS CO.. PHOTOJJTHD.. WASHINGTON. D. C

CHARLES O. 1VIICIIAELSENOF OMAHA, NEBBMEtSZKA.v

ROTARY CLASSIFIER.

Specication of Letters Patent.

Patented May 25, 1915.

Application led August 26, 1913. Serial No. 7 86,806.

. Rotary Classifiers, of which the following is a specification.

My invention relates to screening or'classifying mechanism landespecially to mechanism of this class especially adapted for separating,classifying or grading crushed, pulverized or granular ores.

It is the obj ect of my invention to provide a machine of this classwhich will have. a wide range of utility, the screen devices being soconstructed that the size of the openings through the same may be variedwithout interchanging of parts,y and quickly adjusted so as to pass onlyparticles of material of less than a desired maximum size.

A further object of my invention is to provide a cylindrical rotaryscreen having helical openings therein of uniform width, and

wherein the direction, inclination and width .of the helical openingsmay be varied at will.

In the accompanyingvdrawings, Figure 1 is a side view of a machineembodying my invention, Fig. 2 is a detail longitudinal sectional viewof the same with parts broken away, Fig. 3 is a detail of theend-portions and pivotal attaching means for the screenbars, Fig. 4 is adetail transverse section on the plane of the line of Fig. 2, and Fig. 5is a detail transverse section on the plane of the line g/ of Fig. 2.

In the illustrated embodiment of my invention I provide a tubular shaft1 which is disposed in a position slightly inclined from a horizontalplane and is journaled in bearings 2 carried by standards 3, 4 and 5.The said standards are supported upon a suitable foundation, such asblocks 6 of concrete or the like. In the upper parts of the standards 4and 5 are bearingsin which is `in bearings arranged in the standardsbeneath the bearings for the shaft 7 The gear 10 meshes with a gear 12vwhich is mounted concentrically with the shaft l.

.The gear 12 is preferably connected yieldingly with a hub-body 13 whichis secured to the shaft l, said hub-body and the gear l0 carryingrollers 14 which interfere during the rotation of the gears andperiodically retard the rotative movement of the hub-body and shaft 1,so that a uniform continuous rotation of the driving shaft 7 produces anintermittent or alternately retarded and accelerated rotation of theshaft 1. The detailed construction of the said interrupteddrive gearingis shown in Letters Patent No. 1,040,251, issued to me October l, 1912,and is specifically claimed in the application filed August 3, 1911,Serial No. 642,216, allowed July 9, 1913. v

On the shaft 1 between the standards 3 and 4 is supported a cylindricalscreen comprising essentially a series of flexible flat bars 15 arrangedto form a cylinder, and of which the adjacent endsvare pivotally con- Ynected to parts for holding them at like distances from each other, themeansfor holding the bars at one end being adjustable circumferentiallyofthe cylinder with reference to the means for holding the bars at theother end, so that the inclination of the bars to the axis of theycylinder may be varied, with a resultant variation of the widths of theopenings between the adjacent edges of the bars.

In the structure shown the upper or receiving end of thescreen-cylinder, the end nearest the standard 4, is formed by acylindrical shell 16 which is supported in concentric relation to theshaft 1 by means of a circular flanged end-plate 17 and a spiderring 18,the end-plate 17 v serving to close one end of the shell, andthe otherend of the shell, adjoining the screen-bars 15, being open. Upon theopen end of the shell is disposed the ring 19, thesame being secured tothe shell by screws 20 which pass through circumferential slots in thering, so that when said screws are loosened the ring may be adjustedcircumferentially of the shell. Near one side of the ring an annularchannel is formed therein in which is disposed the pivot-blocks 21. Saidblocks are connected to each other by means of a circular rod or hoop 22which extends through openings in the blocks circumferentially of thechannel. On the outer side of each of the pivot-blocks is a small pin 23which extends through an opening in one of the screen bars so that theblock. The screen-bars are retained' upon the pins 23 by means of thesplit clamp-ring 24 which is disposed around the end-portions of thebars, as shown in Fig. 2, the ends of the clamp-ring being connectedtoeach other by one or more screws 25 so that the ringparts may be drawntogether to clamp the screen-bars against the adjoining portion of thering 19. A portionof the clamp-ring covers the pivot-blocks and normallyfits againsta shoulder on the ring 19, as shown.

The lower or discharge end of the screencylinder, adjacent to thestandard 3, is formed by a cylindrical shell 26 which 1s supported inconcentric relation to the shaft 1 bymeans of a spider 28. Upon saidshell is slidably mounted the ring 29, a screw 30 Y passing through thering andextending into as shown.

a longitudinal slot in the shell to prevent rotation of the ringrelatively to the shell. In the ring 29 there is an annular channel inwhich are-disposed the pivot-blocks 31. The pivot-blocks are: connectedto each other by a' hoop 32, each of the blocks has a pin 33 whichpasses through the end-portion of one of the screen-bars, and thescreen-bars are held upon the pins and against the ring 29 by la splitclamp-ring 34 of which the parts may be drawn together by a screw 35,the structure and arrangement of -the parts mentioned being identicalwith that of the corresponding parts at the other end of thescreen-bars. v

At one side of the ring 29 and integral therewith is a threaded sleeve36 which is engaged by 'an internally-threaded ring 37, The threadedring is rotatable upon the shell 26 and is held in iiXed longitudinalrelation 'to the shell by means of j rings 38 and 39 secured to theshell, an internal annular lip 40 on the threaded ring `extending inbetween said rings 38 and 39. The ring 37 has in its peripheral portiona plurality of 'radial openings 41 into which the lugs of a suitableSpanner-wrench may be inserted and the ring rotated thereby. Obviously,'rotation of the ring 37 will Imove the ring y29 longitudinally ofy theshell and tighten or loosen the screen-bars.

bore of the shaft at a position coincident with 'the baille-plate is aplug 45, and in the sides `of fthe sha-ft 'between the baffle-plate andtheJend-plate 17 are ports'46. The pulveriz'ed ore or lother materialyto be operatedY upon, together with va certain amount of water, are fedinto the upper end of the tubular shaft through a pipe 47, said pipeextending through a packing 48 at the end of theshaft and terminatingnear the ports 46. The material is discharged from the ports 46 into thecylindrical chamber inclosed by the shell 16, end-plate 17 andbaille-plate 44, and escapes from said chamber through the annularopening between the shell and the edges ofthe baille-plate, beingvthereby distributed around the shell in a thin sheet or stream. Onaccount of the inclination of the 'cylinder and its rotary movement, thematerial lflows around the inner surface of the cylinder in ahelicalchine with the material will quickly escapeV through the screen, meansare providedfor supplying an additional quantityl of water thereto afterit has passed over a part of the screen.' For this purpose, a pipe 49iseX- tended into the lower end of the shaft 1 through a suitable packing,the said pipe being connected with a water supply. On the shaft betweenthe spider-rings 18 and 42 are disposed a pair of hollow `cones l50 and51, the first being the largery and its outer edges extending near therim of the spider-ring 42, the smaller cone 51 facing oppositely to thelarger and being disposed so that a narrow opening isleft between theouter edge thereof and the inner surface of the larger cone 50. Thewater supplied through the pipe 49 escapes from the tubular shaftthrough ports 52 formed in the sides thereof'` between the cones 50 and'51, and passes 'outwardly along the inner surface 4of the cone 50,being thereby uniformly distributed yonto the materialspassing over thescreen.

In order to facilitate the passage of the 1 material along the cylinder,'the rims of the spider-rings 184 and 42,*and the inner ends oftheshells 16 and 26r and of the vrings 19 v,

r`and yare beveled as shown in lfig. 2.

Near the lowerror discharge end of the shell 26 a circularplat'e 27- isdisposed upon the shaft 1, said yplate being adjustable longitudinallyof the shaft so that it may be employed to restrict the dischargeopening at the end of the shelfl.- F or receiving the end-` thrust ofthe lshaft due to its inclined position-,a vsuitable thrust-bearing 53is provided adjoining the end of the bearing 2 carried by the standard3.

Referring v4nowparticularly to Fig. 3, it

will be apparent that the slots between the adjacent edges of thescreen-bars 15 will be widest when the bars are 'disposed parallelwiththe axis o'f the'screen-cylinder asshown ybvthe full lines i-n saidfigure; vthat the width `of the fslots' will Abe reduced as ithe isobars Vare inclined to the cylinder-axis as shown by the dotted vlines insaid lfgure5- and that the edges of the bars will finally come intocontact with each other when lthe inclination thereof is sufficientlygreat. The

screen-bars, except when disposed parallel with the cylinder-axis,lextend helically about the cylinder, like a screw-thread of largepitch, the pitch of the helices being least when the inclination of thebars to the vbars are at the desired inclination, then the ring 29 ismoved longitudinally by rotating the threaded ring 37, the peripheralslots in the ring 19 being brought into coincidence longitudinally withthe openings in the shell 16 for the screws 20, said screws 20 thenbeing replaced to hold the ring in iixed relation to the shell 16, thescreen bars then placed under a suitable tension by further longitudinalmovement of the ring 29, and finally the clamp-rings 24, 34 and 43tightened up to retain the parts fixedly in the adjusted position. Whenonly a slight change is made in the inclination of the screen-bars, thescrews 20 need not be entirely removed from the ring 19, but may bemerely loosened enough to permit the ring to be turned. When aconsiderable change is made in the inclination of the screen-bars thelongitudinal adjustment of the ring 29 made by rotating the threadedring 37 may not be suliicient to compensate for the variation in thelongitudinal extension of the screen-bars. In this event the positionofthe shell 26 may be changed by moving the spider 28 longitudinallyupon the shaft. It may be here noted that, for convenience in securingthe various members upon the shaft 1, a spine 54 is provided in one sideof the shaft, the spline extending through the hubportions of theend-plate 17, baffle-plate 44, spider-ring 18, cones 50 and 51,spider-ring 42, spider 28 and the plate 27, so as to prevent rotation ofany of said parts relatively to the shaft. Each of said parts is alsoprovided with suitable set-screws, as shown in Fig. 2, and each ispreferably provided in the bore of the hub with a bushing 55 of materialdifferent from the shaft so as not to be liable to adhere to the shaftby corrosion.

As the screen-bars may be inclined in either direction from the positionparallel with the cylinder-axis, the direction of the helices formed bythe bars may be either to the right or to the left, that is, so as toextend similarly to a right-hand or a lefthand screw-thread. As beforenoted, the

materials fed into the machine pass around the cylinder in a more orless helical path, due to therotary movement of the cylinder and itsdownward inclination from the receiving to the discharging end thereof.As the direction of rotation of the cylinder is always the same, it willbe apparent that when the screen-bars arev inclined in one directionthey will tend to coincide with the path of the material passing alongthe cylinder, and that when inclined in the other direction the barswill tend to assume ay position transverse to the path of the material.It will also be apparent that when inclined in one direction the actionof the bars upon the material will tend to accelerate its movement alongthe cylinder, while when inclined in the other direction the bars willtend to retard the movement of the material along the cylinder. Thesevariations in the action of the mechanism may often be employedadvantageously in the manipulation of different materials, and greatlyextend the range of utility of the machine.

Now, having described my invention, what I claim and desire to secure byLetters Patent is:

1. In a machine of .the class described, a revolubly mounted shaft,cylindrical shells mounted concentrically thereon and spaced apartlongitudinally, rings mounted on the respective shells, means forvarying the position of one of the rings longitudinally and means forvarying the position of the other ring circumferentially of therespective shells, and a plurality of flexible bars connected with therings and extending between them in uniformly-spaced relation to eachother.

2. In a machine of the class described, a revolubly mounted shaft, twolongitudinallyspaced cylindrical shells fixedly mounted on said shaftconcentrically therewith, a ring on one of said shells secured tovariable circumferential relation thereto, a ring on the other shell,means connecting said ring and shell for moving the ring longitudinallyof the shell, a series of flexible screen-bars, and means detachablyconnecting the ends thereof with said rings.

3. In a machine of the class described, a revoluble shaft, twolongitudinally-spaced cylindrical shells mounted thereon concentricallytherewith, a pair of circumferentially-channeled rings mounted on theadjacent ends of said shells, a series of pivotblocks disposed in thechannels of the rings, screen-bars having their ends connected with saidpivot-blocks and extending between the rings, clamping means for holdingthe screen-bars and pivot-blocks in adjusted relations to the rings,means for securing one of the rings in various circumferential relationsto the shell, and means for moving the other ring longitudinally of theshell.

nected with the blocks, the bars extending across the space between therings, and

`aum-00 means for adjust-inggthe lrelative positions of .the 'rings soas fto hold the bars thereby in various helical forms.

In testimony whereof I have hereunto subscribed my name in Ithe presence:of tworwitnesses.

CHARLES lMrcHAnLsEN.

Witnesses D.` O. BARN-ELL, J'. O. DETWEILER.-

Copies of this patent may be obtained for ve cents each, byaddressingthe Commissioner :of Patents, Washington, D. G.

